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Galaxies Featured News
NASA Telescope to Hunt for Black Holes
Gamma ray blast zaps two distant galaxies
Super-massive black holes observed at the center of galaxies
Astrophysicists puzzle over planet that's too close to its sun
Giant telescopes to reveal ancient universe
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Size, composition, and structure of galaxies | Britannica
galaxy, Any of the billions of systems of star s and interstellar matter that make up the universe. Galaxies vary considerably in size, composition, structure, and activity, but nearly all are arranged in groups, or clusters, containing from a few galaxies to as many as 10,000.
Galaxies—facts and information - National Geographic
Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity. Nearly all large galaxies are thought to also...
Galaxies - NASA Science
Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity. The largest contain trillions of stars and can be more than a million light-years across. The smallest can contain a few thousand stars and span just a few hundred light-years.
Types - NASA Science
Types of Galaxies. Scientists sometimes categorize galaxies based on their shapes and physical features. Other classifications organize galaxies by the activity in their central regions – powered by a supersized black hole – and the angle at which we view them.
Galaxies | HubbleSite
Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity. Hubble’s keen eye has revealed intricate details of the shapes, structures, and histories of galaxies — whether alone, as part of small groups, or within immense clusters.
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